KnowraDensity matrixLinked fromLinked fromThe 17 pages that link to Density matrix, each with the reason it gives.All 17Broader topic 3Related 7Narrower topic 4Compared with 3John von NeumannRelated: Density matrices provide the states on which von Neumann’s entropy is defined.Quantum entanglementRelated: Density matrices let entanglement be characterized even when a subsystem is mixed.Black hole information paradoxRelated: Radiation can look thermal as a subsystem even when the complete state remains pure.Hamiltonian (quantum mechanics)Related: Open-system dynamics often describe states with density matrices alongside effective Hamiltonians.Quantum coherenceRelated: Its off-diagonal elements encode coherence between basis states.Probability amplitudeRelated: Its diagonal elements encode outcome probabilities, while off-diagonal elements retain coherence between amplitudes.Bra–ket notationRelated: A pure-state density matrix is written |ψ⟩⟨ψ|.